/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 06:24:47,662 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 06:24:47,665 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 06:24:47,702 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 06:24:47,704 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 06:24:47,712 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 06:24:47,713 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 06:24:47,716 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 06:24:47,719 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 06:24:47,721 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 06:24:47,722 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 06:24:47,723 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 06:24:47,723 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 06:24:47,725 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 06:24:47,727 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 06:24:47,728 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 06:24:47,730 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 06:24:47,731 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 06:24:47,733 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 06:24:47,741 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 06:24:47,743 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 06:24:47,744 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 06:24:47,745 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 06:24:47,746 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 06:24:47,757 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 06:24:47,757 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 06:24:47,757 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 06:24:47,758 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 06:24:47,759 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 06:24:47,761 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-22 06:24:47,766 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 06:24:47,766 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 06:24:47,768 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 06:24:47,769 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 06:24:47,806 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 06:24:47,807 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 06:24:47,809 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 06:24:47,809 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 06:24:47,809 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 06:24:47,809 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 06:24:47,810 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 06:24:47,810 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 06:24:47,810 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 06:24:47,810 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 06:24:47,811 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 06:24:47,812 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 06:24:47,812 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 06:24:47,812 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 06:24:47,812 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 06:24:47,813 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 06:24:47,813 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 06:24:47,813 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 06:24:47,813 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 06:24:47,813 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 06:24:47,813 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 06:24:47,814 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:24:47,814 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 06:24:47,814 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 06:24:47,814 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 06:24:47,814 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 06:24:47,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 06:24:47,815 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 06:24:47,815 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 06:24:47,815 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; [2020-08-22 06:24:48,148 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 06:24:48,160 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 06:24:48,164 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 06:24:48,166 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 06:24:48,166 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 06:24:48,167 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-22 06:24:48,241 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/543fc11ac/db33af546f0c41b798ac76b0decd29bc/FLAGbc6bb7d02 [2020-08-22 06:24:48,681 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 06:24:48,682 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-22 06:24:48,688 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/543fc11ac/db33af546f0c41b798ac76b0decd29bc/FLAGbc6bb7d02 [2020-08-22 06:24:49,112 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/543fc11ac/db33af546f0c41b798ac76b0decd29bc [2020-08-22 06:24:49,123 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 06:24:49,125 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 06:24:49,126 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 06:24:49,126 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 06:24:49,130 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 06:24:49,131 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,134 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f84b4d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49, skipping insertion in model container [2020-08-22 06:24:49,134 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,142 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 06:24:49,160 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 06:24:49,333 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:24:49,338 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 06:24:49,353 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:24:49,365 INFO L208 MainTranslator]: Completed translation [2020-08-22 06:24:49,366 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49 WrapperNode [2020-08-22 06:24:49,366 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 06:24:49,367 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 06:24:49,367 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 06:24:49,367 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 06:24:49,376 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,459 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,459 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,463 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,468 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,469 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (1/1) ... [2020-08-22 06:24:49,470 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 06:24:49,471 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 06:24:49,471 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 06:24:49,471 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 06:24:49,472 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:24:49,531 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 06:24:49,532 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 06:24:49,532 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 06:24:49,532 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 06:24:49,532 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 06:24:49,532 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 06:24:49,533 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 06:24:49,533 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 06:24:49,533 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 06:24:49,533 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 06:24:49,533 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 06:24:49,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 06:24:49,534 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 06:24:49,718 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 06:24:49,719 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 06:24:49,723 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:24:49 BoogieIcfgContainer [2020-08-22 06:24:49,723 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 06:24:49,724 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 06:24:49,725 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 06:24:49,728 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 06:24:49,729 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:24:49" (1/3) ... [2020-08-22 06:24:49,730 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55bb3a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:24:49, skipping insertion in model container [2020-08-22 06:24:49,730 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:49" (2/3) ... [2020-08-22 06:24:49,730 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55bb3a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:24:49, skipping insertion in model container [2020-08-22 06:24:49,731 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:24:49" (3/3) ... [2020-08-22 06:24:49,733 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-22 06:24:49,744 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 06:24:49,751 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 06:24:49,763 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 06:24:49,784 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 06:24:49,785 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 06:24:49,785 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 06:24:49,785 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 06:24:49,785 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 06:24:49,785 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 06:24:49,785 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 06:24:49,785 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 06:24:49,801 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-22 06:24:49,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 06:24:49,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:49,808 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:49,809 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:49,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:49,815 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-22 06:24:49,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:49,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1293166903] [2020-08-22 06:24:49,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:49,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:49,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:49,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:49,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:49,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1293166903] [2020-08-22 06:24:49,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:49,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 06:24:49,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079308682] [2020-08-22 06:24:49,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 06:24:49,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:49,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 06:24:49,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 06:24:49,950 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-22 06:24:49,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:49,968 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-22 06:24:49,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 06:24:49,970 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-22 06:24:49,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:49,977 INFO L225 Difference]: With dead ends: 32 [2020-08-22 06:24:49,977 INFO L226 Difference]: Without dead ends: 13 [2020-08-22 06:24:49,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 06:24:49,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-22 06:24:50,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-22 06:24:50,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-22 06:24:50,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-22 06:24:50,010 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-22 06:24:50,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:50,011 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-22 06:24:50,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 06:24:50,011 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-22 06:24:50,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 06:24:50,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:50,012 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:50,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 06:24:50,013 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:50,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:50,013 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-22 06:24:50,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:50,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [610766794] [2020-08-22 06:24:50,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:50,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:50,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:50,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:50,140 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:50,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [610766794] [2020-08-22 06:24:50,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:50,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 06:24:50,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163506282] [2020-08-22 06:24:50,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:24:50,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:50,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:24:50,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:24:50,147 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-22 06:24:50,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:50,206 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-22 06:24:50,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 06:24:50,207 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-22 06:24:50,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:50,209 INFO L225 Difference]: With dead ends: 21 [2020-08-22 06:24:50,209 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 06:24:50,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:24:50,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 06:24:50,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 06:24:50,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 06:24:50,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-22 06:24:50,216 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-22 06:24:50,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:50,217 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-22 06:24:50,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:24:50,217 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-22 06:24:50,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 06:24:50,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:50,218 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:50,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 06:24:50,219 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:50,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:50,220 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-22 06:24:50,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:50,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933239610] [2020-08-22 06:24:50,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:50,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:50,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:50,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:50,312 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:50,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933239610] [2020-08-22 06:24:50,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:50,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 06:24:50,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131065578] [2020-08-22 06:24:50,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 06:24:50,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:50,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 06:24:50,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:24:50,315 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-22 06:24:50,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:50,420 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-22 06:24:50,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 06:24:50,421 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-22 06:24:50,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:50,422 INFO L225 Difference]: With dead ends: 24 [2020-08-22 06:24:50,423 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 06:24:50,423 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 06:24:50,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 06:24:50,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-22 06:24:50,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-22 06:24:50,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-22 06:24:50,430 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-22 06:24:50,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:50,430 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-22 06:24:50,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 06:24:50,431 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-22 06:24:50,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 06:24:50,432 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:50,432 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:50,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 06:24:50,433 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:50,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:50,433 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-22 06:24:50,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:50,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368832050] [2020-08-22 06:24:50,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:50,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:50,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:50,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:50,546 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:50,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368832050] [2020-08-22 06:24:50,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:50,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 06:24:50,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147680439] [2020-08-22 06:24:50,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 06:24:50,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:50,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 06:24:50,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-22 06:24:50,549 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-22 06:24:50,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:50,673 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-22 06:24:50,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 06:24:50,674 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-22 06:24:50,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:50,675 INFO L225 Difference]: With dead ends: 27 [2020-08-22 06:24:50,675 INFO L226 Difference]: Without dead ends: 22 [2020-08-22 06:24:50,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-22 06:24:50,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-22 06:24:50,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-22 06:24:50,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 06:24:50,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-22 06:24:50,682 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-22 06:24:50,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:50,682 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-22 06:24:50,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 06:24:50,683 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-22 06:24:50,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 06:24:50,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:50,684 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:50,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 06:24:50,684 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:50,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:50,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-22 06:24:50,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:50,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270109834] [2020-08-22 06:24:50,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:50,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:50,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:50,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:50,805 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:50,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270109834] [2020-08-22 06:24:50,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:50,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 06:24:50,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542259215] [2020-08-22 06:24:50,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 06:24:50,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:50,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 06:24:50,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-22 06:24:50,809 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-22 06:24:50,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:50,882 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-22 06:24:50,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 06:24:50,883 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-22 06:24:50,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:50,884 INFO L225 Difference]: With dead ends: 30 [2020-08-22 06:24:50,884 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 06:24:50,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-22 06:24:50,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 06:24:50,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 06:24:50,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 06:24:50,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-22 06:24:50,891 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-22 06:24:50,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:50,893 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-22 06:24:50,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 06:24:50,893 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-22 06:24:50,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 06:24:50,894 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:50,895 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:50,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 06:24:50,895 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:50,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:50,896 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-22 06:24:50,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:50,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496714226] [2020-08-22 06:24:50,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:50,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:51,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:51,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:51,030 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:51,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496714226] [2020-08-22 06:24:51,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:51,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 06:24:51,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607035098] [2020-08-22 06:24:51,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 06:24:51,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:51,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 06:24:51,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-22 06:24:51,032 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-22 06:24:51,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:51,125 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-22 06:24:51,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 06:24:51,126 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-22 06:24:51,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:51,127 INFO L225 Difference]: With dead ends: 33 [2020-08-22 06:24:51,127 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 06:24:51,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-22 06:24:51,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 06:24:51,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-22 06:24:51,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 06:24:51,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-22 06:24:51,137 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-22 06:24:51,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:51,138 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-22 06:24:51,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 06:24:51,138 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-22 06:24:51,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 06:24:51,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:51,145 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:51,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 06:24:51,145 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:51,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:51,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-22 06:24:51,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:51,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954859370] [2020-08-22 06:24:51,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:51,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:51,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:51,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:51,323 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:51,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954859370] [2020-08-22 06:24:51,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:51,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 06:24:51,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464457173] [2020-08-22 06:24:51,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 06:24:51,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:51,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 06:24:51,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-22 06:24:51,326 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-22 06:24:51,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:51,421 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-22 06:24:51,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 06:24:51,422 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-22 06:24:51,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:51,423 INFO L225 Difference]: With dead ends: 36 [2020-08-22 06:24:51,423 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 06:24:51,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-22 06:24:51,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 06:24:51,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-22 06:24:51,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 06:24:51,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-22 06:24:51,430 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-22 06:24:51,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:51,431 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-22 06:24:51,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 06:24:51,431 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-22 06:24:51,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 06:24:51,432 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:51,432 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:51,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 06:24:51,433 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:51,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:51,433 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-22 06:24:51,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:51,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270953861] [2020-08-22 06:24:51,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:51,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:51,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:51,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:51,568 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:51,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270953861] [2020-08-22 06:24:51,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:51,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 06:24:51,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848391333] [2020-08-22 06:24:51,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 06:24:51,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:51,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 06:24:51,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-22 06:24:51,572 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-22 06:24:51,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:51,716 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-22 06:24:51,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 06:24:51,717 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-22 06:24:51,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:51,718 INFO L225 Difference]: With dead ends: 39 [2020-08-22 06:24:51,718 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 06:24:51,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-22 06:24:51,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 06:24:51,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-22 06:24:51,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 06:24:51,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-22 06:24:51,731 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-22 06:24:51,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:51,732 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-22 06:24:51,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 06:24:51,735 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-22 06:24:51,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 06:24:51,736 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:51,736 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:51,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 06:24:51,738 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:51,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:51,738 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-22 06:24:51,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:51,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472393433] [2020-08-22 06:24:51,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:51,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:51,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:51,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:51,940 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:51,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472393433] [2020-08-22 06:24:51,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:51,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 06:24:51,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951715117] [2020-08-22 06:24:51,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 06:24:51,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:51,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 06:24:51,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-22 06:24:51,943 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-22 06:24:52,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:52,123 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-22 06:24:52,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 06:24:52,124 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-22 06:24:52,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:52,125 INFO L225 Difference]: With dead ends: 42 [2020-08-22 06:24:52,125 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 06:24:52,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-22 06:24:52,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 06:24:52,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-22 06:24:52,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 06:24:52,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-22 06:24:52,142 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-22 06:24:52,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:52,148 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-22 06:24:52,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 06:24:52,148 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-22 06:24:52,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 06:24:52,149 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:52,149 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:52,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 06:24:52,150 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:52,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:52,151 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-22 06:24:52,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:52,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519167380] [2020-08-22 06:24:52,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:52,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:52,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:52,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:52,307 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:52,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519167380] [2020-08-22 06:24:52,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:52,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 06:24:52,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128458593] [2020-08-22 06:24:52,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 06:24:52,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:52,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 06:24:52,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-22 06:24:52,310 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-22 06:24:52,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:52,474 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-22 06:24:52,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 06:24:52,474 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-22 06:24:52,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:52,475 INFO L225 Difference]: With dead ends: 45 [2020-08-22 06:24:52,475 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 06:24:52,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-22 06:24:52,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 06:24:52,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-22 06:24:52,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 06:24:52,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-22 06:24:52,482 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-22 06:24:52,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:52,483 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-22 06:24:52,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 06:24:52,483 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-22 06:24:52,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 06:24:52,484 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:52,484 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:52,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 06:24:52,485 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:52,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:52,485 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-22 06:24:52,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:52,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815312921] [2020-08-22 06:24:52,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:52,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:52,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:52,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:52,646 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:52,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [815312921] [2020-08-22 06:24:52,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:52,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 06:24:52,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475974541] [2020-08-22 06:24:52,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 06:24:52,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:52,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 06:24:52,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-22 06:24:52,649 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-22 06:24:52,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:52,841 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-22 06:24:52,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 06:24:52,842 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-22 06:24:52,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:52,843 INFO L225 Difference]: With dead ends: 48 [2020-08-22 06:24:52,843 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 06:24:52,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-22 06:24:52,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 06:24:52,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-22 06:24:52,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 06:24:52,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-22 06:24:52,850 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-22 06:24:52,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:52,851 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-22 06:24:52,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 06:24:52,851 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-22 06:24:52,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 06:24:52,852 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:52,852 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:52,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 06:24:52,853 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:52,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:52,853 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-22 06:24:52,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:52,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1461858522] [2020-08-22 06:24:52,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:52,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:53,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,059 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:53,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1461858522] [2020-08-22 06:24:53,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:53,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 06:24:53,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301103839] [2020-08-22 06:24:53,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 06:24:53,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:53,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 06:24:53,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-22 06:24:53,063 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-22 06:24:53,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:53,311 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-22 06:24:53,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 06:24:53,312 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-22 06:24:53,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:53,312 INFO L225 Difference]: With dead ends: 51 [2020-08-22 06:24:53,313 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 06:24:53,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-22 06:24:53,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 06:24:53,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-22 06:24:53,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 06:24:53,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-22 06:24:53,325 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-22 06:24:53,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:53,326 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-22 06:24:53,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 06:24:53,326 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-22 06:24:53,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 06:24:53,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:53,327 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:53,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 06:24:53,327 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:53,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:53,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-22 06:24:53,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:53,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567703219] [2020-08-22 06:24:53,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:53,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:53,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,531 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:53,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567703219] [2020-08-22 06:24:53,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:53,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 06:24:53,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047512101] [2020-08-22 06:24:53,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 06:24:53,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:53,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 06:24:53,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-22 06:24:53,533 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-22 06:24:53,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:53,823 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-22 06:24:53,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 06:24:53,824 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-22 06:24:53,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:53,825 INFO L225 Difference]: With dead ends: 54 [2020-08-22 06:24:53,825 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 06:24:53,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-22 06:24:53,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 06:24:53,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 06:24:53,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 06:24:53,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-22 06:24:53,833 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-22 06:24:53,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:53,834 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-22 06:24:53,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 06:24:53,834 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-22 06:24:53,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 06:24:53,835 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:53,835 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:53,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 06:24:53,835 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:53,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:53,836 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-22 06:24:53,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:53,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395935310] [2020-08-22 06:24:53,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:53,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:54,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,049 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:54,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395935310] [2020-08-22 06:24:54,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:54,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 06:24:54,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508478949] [2020-08-22 06:24:54,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 06:24:54,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:54,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 06:24:54,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-22 06:24:54,051 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-22 06:24:54,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:54,338 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-22 06:24:54,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 06:24:54,339 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-22 06:24:54,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:54,340 INFO L225 Difference]: With dead ends: 57 [2020-08-22 06:24:54,340 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 06:24:54,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-22 06:24:54,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 06:24:54,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-22 06:24:54,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 06:24:54,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-22 06:24:54,347 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-22 06:24:54,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:54,348 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-22 06:24:54,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 06:24:54,348 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-22 06:24:54,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 06:24:54,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:54,349 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:54,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 06:24:54,349 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:54,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:54,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-22 06:24:54,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:54,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806168856] [2020-08-22 06:24:54,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:54,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:54,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,600 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:54,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806168856] [2020-08-22 06:24:54,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:54,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 06:24:54,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153994494] [2020-08-22 06:24:54,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 06:24:54,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:54,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 06:24:54,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-22 06:24:54,603 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-22 06:24:54,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:54,931 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-22 06:24:54,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 06:24:54,931 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-22 06:24:54,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:54,932 INFO L225 Difference]: With dead ends: 60 [2020-08-22 06:24:54,933 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 06:24:54,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-22 06:24:54,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 06:24:54,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-22 06:24:54,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 06:24:54,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-22 06:24:54,949 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-22 06:24:54,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:54,950 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-22 06:24:54,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 06:24:54,950 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-22 06:24:54,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 06:24:54,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:54,951 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:54,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 06:24:54,951 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:54,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:54,952 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-22 06:24:54,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:54,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018204355] [2020-08-22 06:24:54,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:54,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:55,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,274 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:55,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018204355] [2020-08-22 06:24:55,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:55,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 06:24:55,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268836179] [2020-08-22 06:24:55,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 06:24:55,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:55,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 06:24:55,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-22 06:24:55,276 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-22 06:24:55,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:55,651 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-22 06:24:55,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 06:24:55,651 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-22 06:24:55,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:55,652 INFO L225 Difference]: With dead ends: 63 [2020-08-22 06:24:55,652 INFO L226 Difference]: Without dead ends: 58 [2020-08-22 06:24:55,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-22 06:24:55,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-22 06:24:55,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-22 06:24:55,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 06:24:55,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-22 06:24:55,669 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-22 06:24:55,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:55,669 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-22 06:24:55,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 06:24:55,669 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-22 06:24:55,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 06:24:55,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:55,674 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:55,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 06:24:55,674 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:55,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:55,674 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-22 06:24:55,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:55,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081116536] [2020-08-22 06:24:55,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:55,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:55,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,964 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:55,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081116536] [2020-08-22 06:24:55,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:55,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 06:24:55,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932157267] [2020-08-22 06:24:55,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 06:24:55,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:55,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 06:24:55,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-22 06:24:55,967 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-22 06:24:56,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:56,381 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-22 06:24:56,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 06:24:56,382 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-22 06:24:56,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:56,383 INFO L225 Difference]: With dead ends: 66 [2020-08-22 06:24:56,383 INFO L226 Difference]: Without dead ends: 61 [2020-08-22 06:24:56,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-22 06:24:56,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-22 06:24:56,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-22 06:24:56,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-22 06:24:56,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-22 06:24:56,391 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-22 06:24:56,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:56,391 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-22 06:24:56,391 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 06:24:56,391 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-22 06:24:56,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-22 06:24:56,392 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:56,392 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:56,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 06:24:56,393 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:56,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:56,393 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-22 06:24:56,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:56,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1895009296] [2020-08-22 06:24:56,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:56,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:56,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:56,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:56,724 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:56,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1895009296] [2020-08-22 06:24:56,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:56,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 06:24:56,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607493200] [2020-08-22 06:24:56,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 06:24:56,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:56,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 06:24:56,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-22 06:24:56,727 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-22 06:24:57,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:57,189 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-22 06:24:57,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 06:24:57,193 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-22 06:24:57,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:57,194 INFO L225 Difference]: With dead ends: 69 [2020-08-22 06:24:57,194 INFO L226 Difference]: Without dead ends: 64 [2020-08-22 06:24:57,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-22 06:24:57,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-22 06:24:57,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-22 06:24:57,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-22 06:24:57,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-22 06:24:57,202 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-22 06:24:57,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:57,202 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-22 06:24:57,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 06:24:57,202 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-22 06:24:57,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-22 06:24:57,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:57,203 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:57,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 06:24:57,203 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:57,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:57,204 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-22 06:24:57,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:57,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671486749] [2020-08-22 06:24:57,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:57,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:57,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:57,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:57,598 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:57,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671486749] [2020-08-22 06:24:57,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:57,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 06:24:57,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704733707] [2020-08-22 06:24:57,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 06:24:57,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:57,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 06:24:57,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-22 06:24:57,600 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-22 06:24:58,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:58,100 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-22 06:24:58,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 06:24:58,104 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-22 06:24:58,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:58,105 INFO L225 Difference]: With dead ends: 72 [2020-08-22 06:24:58,105 INFO L226 Difference]: Without dead ends: 67 [2020-08-22 06:24:58,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-22 06:24:58,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-22 06:24:58,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-22 06:24:58,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-22 06:24:58,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-22 06:24:58,113 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-22 06:24:58,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:58,113 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-22 06:24:58,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 06:24:58,113 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-22 06:24:58,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-22 06:24:58,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:58,114 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:58,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 06:24:58,114 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:58,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:58,115 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-22 06:24:58,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:58,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498784431] [2020-08-22 06:24:58,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:58,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:58,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:58,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:58,464 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:58,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498784431] [2020-08-22 06:24:58,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:58,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 06:24:58,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083809963] [2020-08-22 06:24:58,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 06:24:58,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:58,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 06:24:58,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-22 06:24:58,467 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-22 06:24:58,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:58,994 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-22 06:24:58,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 06:24:58,994 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-22 06:24:58,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:58,995 INFO L225 Difference]: With dead ends: 75 [2020-08-22 06:24:58,996 INFO L226 Difference]: Without dead ends: 70 [2020-08-22 06:24:58,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-22 06:24:58,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-22 06:24:59,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-22 06:24:59,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 06:24:59,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-22 06:24:59,003 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-22 06:24:59,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:59,004 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-22 06:24:59,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 06:24:59,004 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-22 06:24:59,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 06:24:59,005 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:59,005 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:59,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 06:24:59,005 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:59,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:59,006 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-22 06:24:59,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:59,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629171986] [2020-08-22 06:24:59,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:59,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:59,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:59,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:59,406 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:59,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629171986] [2020-08-22 06:24:59,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:59,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 06:24:59,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522585175] [2020-08-22 06:24:59,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 06:24:59,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:59,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 06:24:59,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-22 06:24:59,408 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-22 06:25:00,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:00,018 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-22 06:25:00,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 06:25:00,019 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-22 06:25:00,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:00,020 INFO L225 Difference]: With dead ends: 78 [2020-08-22 06:25:00,020 INFO L226 Difference]: Without dead ends: 73 [2020-08-22 06:25:00,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-22 06:25:00,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-22 06:25:00,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-22 06:25:00,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-22 06:25:00,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-22 06:25:00,032 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-22 06:25:00,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:00,032 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-22 06:25:00,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 06:25:00,033 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-22 06:25:00,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-22 06:25:00,033 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:00,034 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:00,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 06:25:00,034 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:00,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:00,034 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-22 06:25:00,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:00,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1451579074] [2020-08-22 06:25:00,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:00,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:00,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:00,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:00,513 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:00,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1451579074] [2020-08-22 06:25:00,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:00,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 06:25:00,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830884228] [2020-08-22 06:25:00,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 06:25:00,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:00,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 06:25:00,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-22 06:25:00,516 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-22 06:25:01,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:01,202 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-22 06:25:01,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 06:25:01,206 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-22 06:25:01,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:01,206 INFO L225 Difference]: With dead ends: 81 [2020-08-22 06:25:01,206 INFO L226 Difference]: Without dead ends: 76 [2020-08-22 06:25:01,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-22 06:25:01,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-22 06:25:01,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-22 06:25:01,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-22 06:25:01,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-22 06:25:01,216 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-22 06:25:01,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:01,217 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-22 06:25:01,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 06:25:01,217 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-22 06:25:01,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-22 06:25:01,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:01,220 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:01,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 06:25:01,221 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:01,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:01,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-22 06:25:01,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:01,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255309841] [2020-08-22 06:25:01,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:01,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:01,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:01,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:01,707 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:01,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255309841] [2020-08-22 06:25:01,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:01,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 06:25:01,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049432629] [2020-08-22 06:25:01,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 06:25:01,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:01,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 06:25:01,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-22 06:25:01,709 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-22 06:25:02,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:02,424 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-22 06:25:02,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 06:25:02,424 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-22 06:25:02,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:02,425 INFO L225 Difference]: With dead ends: 84 [2020-08-22 06:25:02,425 INFO L226 Difference]: Without dead ends: 79 [2020-08-22 06:25:02,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-22 06:25:02,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-22 06:25:02,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-22 06:25:02,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-22 06:25:02,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-22 06:25:02,433 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-22 06:25:02,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:02,435 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-22 06:25:02,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 06:25:02,435 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-22 06:25:02,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-22 06:25:02,436 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:02,436 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:02,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 06:25:02,436 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:02,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:02,437 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-22 06:25:02,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:02,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227582546] [2020-08-22 06:25:02,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:02,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:02,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:02,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:02,995 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:02,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227582546] [2020-08-22 06:25:02,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:02,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 06:25:02,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111610819] [2020-08-22 06:25:02,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 06:25:02,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:02,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 06:25:02,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-22 06:25:02,998 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-22 06:25:03,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:03,943 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-22 06:25:03,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 06:25:03,944 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-22 06:25:03,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:03,945 INFO L225 Difference]: With dead ends: 87 [2020-08-22 06:25:03,945 INFO L226 Difference]: Without dead ends: 82 [2020-08-22 06:25:03,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-22 06:25:03,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-22 06:25:03,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-22 06:25:03,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-22 06:25:03,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-22 06:25:03,956 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-22 06:25:03,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:03,956 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-22 06:25:03,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 06:25:03,957 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-22 06:25:03,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-22 06:25:03,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:03,958 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:03,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 06:25:03,960 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:03,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:03,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-22 06:25:03,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:03,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1366555454] [2020-08-22 06:25:03,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:04,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:04,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:04,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:04,513 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:04,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1366555454] [2020-08-22 06:25:04,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:04,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 06:25:04,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718059788] [2020-08-22 06:25:04,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 06:25:04,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:04,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 06:25:04,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-22 06:25:04,516 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-22 06:25:05,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:05,379 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-22 06:25:05,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 06:25:05,379 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-22 06:25:05,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:05,380 INFO L225 Difference]: With dead ends: 90 [2020-08-22 06:25:05,380 INFO L226 Difference]: Without dead ends: 85 [2020-08-22 06:25:05,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-22 06:25:05,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-22 06:25:05,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-22 06:25:05,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-22 06:25:05,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-22 06:25:05,387 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-22 06:25:05,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:05,387 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-22 06:25:05,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 06:25:05,388 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-22 06:25:05,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-22 06:25:05,388 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:05,389 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:05,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 06:25:05,389 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:05,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:05,389 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-22 06:25:05,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:05,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [539318127] [2020-08-22 06:25:05,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:05,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:05,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:05,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:05,977 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:05,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [539318127] [2020-08-22 06:25:05,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:05,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 06:25:05,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757921430] [2020-08-22 06:25:05,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 06:25:05,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:05,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 06:25:05,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-22 06:25:05,979 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-22 06:25:06,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:06,939 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-22 06:25:06,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 06:25:06,940 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-22 06:25:06,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:06,941 INFO L225 Difference]: With dead ends: 93 [2020-08-22 06:25:06,941 INFO L226 Difference]: Without dead ends: 88 [2020-08-22 06:25:06,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-22 06:25:06,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-22 06:25:06,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-22 06:25:06,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-22 06:25:06,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-22 06:25:06,949 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-22 06:25:06,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:06,949 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-22 06:25:06,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 06:25:06,950 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-22 06:25:06,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-22 06:25:06,950 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:06,951 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:06,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 06:25:06,951 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:06,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:06,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-22 06:25:06,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:06,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98588683] [2020-08-22 06:25:06,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:06,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:07,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:07,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:07,620 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:07,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98588683] [2020-08-22 06:25:07,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:07,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 06:25:07,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401590491] [2020-08-22 06:25:07,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 06:25:07,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:07,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 06:25:07,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-22 06:25:07,623 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-22 06:25:08,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:08,587 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-22 06:25:08,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 06:25:08,588 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-22 06:25:08,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:08,590 INFO L225 Difference]: With dead ends: 96 [2020-08-22 06:25:08,590 INFO L226 Difference]: Without dead ends: 91 [2020-08-22 06:25:08,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-22 06:25:08,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-22 06:25:08,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-22 06:25:08,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-22 06:25:08,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-22 06:25:08,599 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-22 06:25:08,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:08,599 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-22 06:25:08,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 06:25:08,599 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-22 06:25:08,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-22 06:25:08,600 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:08,600 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:08,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 06:25:08,601 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:08,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:08,601 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-22 06:25:08,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:08,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275867065] [2020-08-22 06:25:08,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:08,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:09,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:09,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:09,320 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:09,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275867065] [2020-08-22 06:25:09,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:09,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 06:25:09,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109104455] [2020-08-22 06:25:09,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 06:25:09,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:09,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 06:25:09,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-22 06:25:09,322 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-22 06:25:10,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:10,416 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-22 06:25:10,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 06:25:10,417 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-22 06:25:10,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:10,418 INFO L225 Difference]: With dead ends: 99 [2020-08-22 06:25:10,418 INFO L226 Difference]: Without dead ends: 94 [2020-08-22 06:25:10,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-22 06:25:10,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-22 06:25:10,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-22 06:25:10,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-22 06:25:10,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-22 06:25:10,426 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-22 06:25:10,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:10,426 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-22 06:25:10,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 06:25:10,426 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-22 06:25:10,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-22 06:25:10,427 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:10,427 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:10,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 06:25:10,428 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:10,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:10,428 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-22 06:25:10,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:10,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279547878] [2020-08-22 06:25:10,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:10,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:11,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:11,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:11,154 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:11,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279547878] [2020-08-22 06:25:11,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:11,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 06:25:11,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397682788] [2020-08-22 06:25:11,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 06:25:11,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:11,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 06:25:11,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-22 06:25:11,156 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-22 06:25:12,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:12,294 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-22 06:25:12,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 06:25:12,295 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-22 06:25:12,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:12,296 INFO L225 Difference]: With dead ends: 102 [2020-08-22 06:25:12,296 INFO L226 Difference]: Without dead ends: 97 [2020-08-22 06:25:12,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 06:25:12,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-22 06:25:12,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-22 06:25:12,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-22 06:25:12,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-22 06:25:12,305 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-22 06:25:12,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:12,305 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-22 06:25:12,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 06:25:12,306 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-22 06:25:12,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-22 06:25:12,306 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:12,307 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:12,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 06:25:12,307 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:12,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:12,307 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-22 06:25:12,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:12,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375841808] [2020-08-22 06:25:12,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:12,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:13,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:13,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:13,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:13,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375841808] [2020-08-22 06:25:13,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:13,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 06:25:13,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335546955] [2020-08-22 06:25:13,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 06:25:13,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:13,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 06:25:13,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 06:25:13,042 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-22 06:25:14,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:14,301 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-22 06:25:14,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 06:25:14,301 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-22 06:25:14,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:14,302 INFO L225 Difference]: With dead ends: 105 [2020-08-22 06:25:14,302 INFO L226 Difference]: Without dead ends: 100 [2020-08-22 06:25:14,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 06:25:14,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-22 06:25:14,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-22 06:25:14,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-22 06:25:14,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-22 06:25:14,311 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-22 06:25:14,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:14,312 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-22 06:25:14,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 06:25:14,312 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-22 06:25:14,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-22 06:25:14,313 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:14,313 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:14,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 06:25:14,313 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:14,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:14,313 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-22 06:25:14,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:14,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [738959020] [2020-08-22 06:25:14,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:14,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:15,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:15,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:15,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:15,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [738959020] [2020-08-22 06:25:15,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:15,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 06:25:15,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771114628] [2020-08-22 06:25:15,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 06:25:15,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:15,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 06:25:15,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 06:25:15,111 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-22 06:25:16,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:16,450 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-22 06:25:16,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 06:25:16,450 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-22 06:25:16,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:16,452 INFO L225 Difference]: With dead ends: 108 [2020-08-22 06:25:16,452 INFO L226 Difference]: Without dead ends: 103 [2020-08-22 06:25:16,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 06:25:16,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-22 06:25:16,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-22 06:25:16,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-22 06:25:16,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-22 06:25:16,461 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-22 06:25:16,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:16,462 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-22 06:25:16,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 06:25:16,462 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-22 06:25:16,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-22 06:25:16,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:16,463 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:16,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 06:25:16,463 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:16,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:16,464 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-22 06:25:16,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:16,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160319580] [2020-08-22 06:25:16,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:16,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:17,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:17,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:17,308 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:17,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160319580] [2020-08-22 06:25:17,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:17,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 06:25:17,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55889298] [2020-08-22 06:25:17,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 06:25:17,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:17,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 06:25:17,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 06:25:17,311 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-22 06:25:18,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:18,743 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-22 06:25:18,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 06:25:18,751 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-22 06:25:18,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:18,752 INFO L225 Difference]: With dead ends: 111 [2020-08-22 06:25:18,752 INFO L226 Difference]: Without dead ends: 106 [2020-08-22 06:25:18,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 06:25:18,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-22 06:25:18,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-22 06:25:18,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-22 06:25:18,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-22 06:25:18,763 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-22 06:25:18,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:18,764 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-22 06:25:18,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 06:25:18,764 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-22 06:25:18,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-22 06:25:18,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:18,765 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:18,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 06:25:18,765 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:18,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:18,765 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-22 06:25:18,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:18,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123468087] [2020-08-22 06:25:18,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:18,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:19,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:19,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:19,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:19,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123468087] [2020-08-22 06:25:19,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:19,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 06:25:19,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183866782] [2020-08-22 06:25:19,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 06:25:19,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:19,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 06:25:19,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 06:25:19,580 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-22 06:25:21,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:21,077 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-22 06:25:21,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 06:25:21,077 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-22 06:25:21,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:21,079 INFO L225 Difference]: With dead ends: 114 [2020-08-22 06:25:21,079 INFO L226 Difference]: Without dead ends: 109 [2020-08-22 06:25:21,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 06:25:21,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-22 06:25:21,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-22 06:25:21,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-22 06:25:21,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-22 06:25:21,088 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-22 06:25:21,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:21,089 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-22 06:25:21,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 06:25:21,089 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-22 06:25:21,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-22 06:25:21,090 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:21,090 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:21,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 06:25:21,090 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:21,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:21,090 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-22 06:25:21,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:21,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686030934] [2020-08-22 06:25:21,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:21,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:22,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:22,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:22,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:22,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686030934] [2020-08-22 06:25:22,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:22,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 06:25:22,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150302917] [2020-08-22 06:25:22,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 06:25:22,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:22,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 06:25:22,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 06:25:22,051 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-22 06:25:23,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:23,627 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-22 06:25:23,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 06:25:23,628 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-22 06:25:23,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:23,629 INFO L225 Difference]: With dead ends: 117 [2020-08-22 06:25:23,629 INFO L226 Difference]: Without dead ends: 112 [2020-08-22 06:25:23,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 06:25:23,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-22 06:25:23,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-22 06:25:23,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-22 06:25:23,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-22 06:25:23,641 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-22 06:25:23,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:23,641 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-22 06:25:23,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 06:25:23,641 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-22 06:25:23,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-22 06:25:23,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:23,642 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:23,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 06:25:23,642 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:23,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:23,643 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-22 06:25:23,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:23,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468655357] [2020-08-22 06:25:23,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:23,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:24,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:24,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:24,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:24,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468655357] [2020-08-22 06:25:24,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:24,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 06:25:24,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765431676] [2020-08-22 06:25:24,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 06:25:24,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:24,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 06:25:24,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 06:25:24,667 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-22 06:25:26,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:26,407 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-22 06:25:26,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 06:25:26,408 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-22 06:25:26,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:26,409 INFO L225 Difference]: With dead ends: 120 [2020-08-22 06:25:26,409 INFO L226 Difference]: Without dead ends: 115 [2020-08-22 06:25:26,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 06:25:26,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-22 06:25:26,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-22 06:25:26,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-22 06:25:26,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-22 06:25:26,420 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-22 06:25:26,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:26,420 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-22 06:25:26,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 06:25:26,420 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-22 06:25:26,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-22 06:25:26,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:26,421 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:26,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 06:25:26,421 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:26,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:26,422 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-22 06:25:26,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:26,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378659850] [2020-08-22 06:25:26,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:26,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:27,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:27,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:27,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:27,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1378659850] [2020-08-22 06:25:27,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:27,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 06:25:27,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157203707] [2020-08-22 06:25:27,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 06:25:27,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:27,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 06:25:27,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 06:25:27,480 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-22 06:25:29,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:29,313 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-22 06:25:29,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 06:25:29,314 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-22 06:25:29,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:29,315 INFO L225 Difference]: With dead ends: 123 [2020-08-22 06:25:29,315 INFO L226 Difference]: Without dead ends: 118 [2020-08-22 06:25:29,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 06:25:29,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-22 06:25:29,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-22 06:25:29,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-22 06:25:29,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-22 06:25:29,326 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-22 06:25:29,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:29,326 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-22 06:25:29,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 06:25:29,326 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-22 06:25:29,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-22 06:25:29,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:29,327 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:29,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 06:25:29,328 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:29,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:29,328 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-22 06:25:29,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:29,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48735341] [2020-08-22 06:25:29,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:29,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:30,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:30,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:30,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:30,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48735341] [2020-08-22 06:25:30,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:30,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 06:25:30,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454497327] [2020-08-22 06:25:30,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 06:25:30,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:30,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 06:25:30,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 06:25:30,445 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-22 06:25:32,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:32,352 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-22 06:25:32,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 06:25:32,352 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-22 06:25:32,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:32,354 INFO L225 Difference]: With dead ends: 126 [2020-08-22 06:25:32,354 INFO L226 Difference]: Without dead ends: 121 [2020-08-22 06:25:32,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 06:25:32,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-22 06:25:32,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-22 06:25:32,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-22 06:25:32,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-22 06:25:32,365 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-22 06:25:32,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:32,365 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-22 06:25:32,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 06:25:32,366 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-22 06:25:32,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-22 06:25:32,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:32,367 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:32,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 06:25:32,367 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:32,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:32,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-22 06:25:32,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:32,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32439868] [2020-08-22 06:25:32,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:32,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:33,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:33,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:33,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:33,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32439868] [2020-08-22 06:25:33,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:33,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 06:25:33,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959494350] [2020-08-22 06:25:33,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 06:25:33,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:33,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 06:25:33,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 06:25:33,526 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-22 06:25:35,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:35,572 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-22 06:25:35,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 06:25:35,573 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-22 06:25:35,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:35,575 INFO L225 Difference]: With dead ends: 129 [2020-08-22 06:25:35,575 INFO L226 Difference]: Without dead ends: 124 [2020-08-22 06:25:35,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 06:25:35,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-22 06:25:35,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-22 06:25:35,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-22 06:25:35,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-22 06:25:35,587 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-22 06:25:35,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:35,588 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-22 06:25:35,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 06:25:35,588 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-22 06:25:35,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-22 06:25:35,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:35,589 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:35,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 06:25:35,589 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:35,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:35,590 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-22 06:25:35,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:35,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514959172] [2020-08-22 06:25:35,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:35,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:36,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:36,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:36,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:36,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514959172] [2020-08-22 06:25:36,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:36,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 06:25:36,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125572087] [2020-08-22 06:25:36,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 06:25:36,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:36,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 06:25:36,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 06:25:36,794 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-22 06:25:38,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:38,952 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-22 06:25:38,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 06:25:38,952 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-22 06:25:38,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:38,954 INFO L225 Difference]: With dead ends: 132 [2020-08-22 06:25:38,954 INFO L226 Difference]: Without dead ends: 127 [2020-08-22 06:25:38,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 06:25:38,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-22 06:25:38,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-22 06:25:38,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-22 06:25:38,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-22 06:25:38,969 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-22 06:25:38,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:38,970 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-22 06:25:38,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-22 06:25:38,970 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-22 06:25:38,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-22 06:25:38,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:38,971 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:38,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 06:25:38,971 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:38,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:38,971 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-22 06:25:38,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:38,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127658350] [2020-08-22 06:25:38,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:39,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:40,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:40,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:40,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:40,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127658350] [2020-08-22 06:25:40,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:40,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-22 06:25:40,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556137947] [2020-08-22 06:25:40,275 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-22 06:25:40,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:40,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-22 06:25:40,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 06:25:40,276 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-22 06:25:42,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:42,553 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-22 06:25:42,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-22 06:25:42,554 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-22 06:25:42,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:42,555 INFO L225 Difference]: With dead ends: 135 [2020-08-22 06:25:42,555 INFO L226 Difference]: Without dead ends: 130 [2020-08-22 06:25:42,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 06:25:42,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-22 06:25:42,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-22 06:25:42,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-22 06:25:42,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-22 06:25:42,568 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-22 06:25:42,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:42,569 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-22 06:25:42,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-22 06:25:42,569 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-22 06:25:42,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-22 06:25:42,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:42,570 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:42,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 06:25:42,570 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:42,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:42,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-22 06:25:42,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:42,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081595256] [2020-08-22 06:25:42,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:42,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:43,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:43,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:43,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:43,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081595256] [2020-08-22 06:25:43,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:43,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-22 06:25:43,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166779355] [2020-08-22 06:25:43,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-22 06:25:43,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:43,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-22 06:25:43,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 06:25:43,944 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-22 06:25:46,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:46,299 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-22 06:25:46,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-22 06:25:46,299 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-22 06:25:46,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:46,301 INFO L225 Difference]: With dead ends: 138 [2020-08-22 06:25:46,302 INFO L226 Difference]: Without dead ends: 133 [2020-08-22 06:25:46,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 06:25:46,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-22 06:25:46,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-22 06:25:46,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-22 06:25:46,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-22 06:25:46,316 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-22 06:25:46,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:46,316 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-22 06:25:46,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-22 06:25:46,317 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-22 06:25:46,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-22 06:25:46,317 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:46,317 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:46,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 06:25:46,318 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:46,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:46,318 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-22 06:25:46,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:46,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643776044] [2020-08-22 06:25:46,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:46,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:47,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:47,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:47,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:25:47,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643776044] [2020-08-22 06:25:47,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:47,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-22 06:25:47,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653550796] [2020-08-22 06:25:47,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-22 06:25:47,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:47,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-22 06:25:47,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 06:25:47,804 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.